<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>     
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品的信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center="">
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price"  type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类">
                                <el-cascader
                                expand-trigger="hover"
                                v-model="addForm.goods_cat"
                                :options="cateList"
                                :props="cateProps"
                                @change="handleChange"
                                prop="goods_cat"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                                <el-checkbox-group v-model="item.attr_vals">
                                    <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border=""></el-checkbox>
                                </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action表示图片要上传到的后台api地址 -->
                        <el-upload
                        action="http://127.0.0.1:8888/api/private/v1/upload"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture"
                        :headers="headerObj"
                        :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce">
                        </quill-editor>
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <span>
            <img :src="previewPath" alt="" class="previewImg">
        </span>
       </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data(){
        return{
            //进度条所在位置索引
            activeIndex:'0',
            //添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                goods_cat:[],
                //图片的数组
                pics:[],
                attrs:[],
                //商品的详情描述
                goods_introduce:''
            },
            //表单的验证规则对象
            addFormRules:{
                goods_name:[{required:true,message:'请输入商品名称',trigger:'blur'}],
                goods_price:[{required:true,message:'请输入商品价格',trigger:'blur'}],
                goods_weight:[{required:true,message:'请输入商品重量',trigger:'blur'}],
                goods_number:[{required:true,message:'请输入商品数量',trigger:'blur'}],
                goods_cat:[{required:true,message:'请选择商品分类',trigger:'blur'}]
            },
            //商品分类列表
            cateList:[],
            //级联选择框属性
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            //动态参数列表数组
            manyTableData:[],
            //静态属性数组列表
            onlyTableData:[],
            //图片上传组件的headers请求头对象
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            //保存的图片的url
            previewPath:'',
            //图片的显示与隐藏
            previewVisible:false,


        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取所有的商品分类数据
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品列表分类数据失败！')
            }
            this.cateList=res.data
            console.log(this.cateList);
            
        },
        //级联选择器选中项变化，会触发这个函数
        handleChange(){  
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat=[]
            }
        },
        //发生tab切换时的判断函数
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName==='0' && this.addForm.goods_cat.length!==3){
                this.$message.error('请先选择商品分类！')
                return false
            }
        },
        async tabClicked(){
            if(this.activeIndex==1){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                   params:{sel:'many'}
               })
               if(res.meta.status!==200){
                   return this.$message.error('获取动态参数列表失败！')
               }
               res.data.forEach(item=>{
                   item.attr_vals=item.attr_vals.length==0? []:item.attr_vals.split(' ')
               })
               this.manyTableData=res.data

           }else if(this.activeIndex==2){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                   params:{sel:'only'}
               })
               if(res.meta.status!==200){
                   return this.$message.error('获取心态属性失败！')
               }
               this.onlyTableData=res.data
               
           }            
        },
        // 图片预览处理的业务逻辑
        handlePreview(file){
            this.previewPath=file.response.data.url
            this.previewVisible=true
        },
        //处理移除图片的操作
        handleRemove(file){
            //获取要删除的图片的临时路径
            const filePath=file.response.data.temp_path
            //从数组中找到这个图片的对应的索引值
            const i=this.addForm.pics.findIndex(x=>x.pic===filePath)
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);
            
            
        },
        //监听图片上传成功的事件
        handleSuccess(response){
            //先拼接得到一个图片对象
            const picInfo={pic:response.data.temp_path}
            //将图片对象push到pics数组中
            this.addForm.pics.push(picInfo)      
        },
        //添加商品
        add(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项！')
                }
                const form=_.cloneDeep(this.addForm)
                //执行添加的业务逻辑
                //lodash closeDeep() 进行深拷贝
                form.goods_cat=this.addForm.goods_cat.join(',')
                //处理动态参数
                this.manyTableData.forEach(item=>{
                    const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                //处理静态属性
                this.onlyTableData.forEach(item=>{
                    const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs=this.addForm.attrs
                console.log(form);

                //发起请求添加商品
                const {data:res}=await this.$http.post('goods',form)
                if(res.meta.status!==201){
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
                
            })
            
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
// test
</script>

<style lang="less" scoped>
.el-checkbox{
    margin:0 5px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top:15px ;
}
</style>
